Signal suspension and resumption in DSL systems

Abstract

A method includes maintaining temporally parallel DSL data communication sessions with DSL modems of a group via a set of lines. The method includes, in response to substantially stopping to receive DSL communications from one of the DSL modems via one of the lines, transmitting a substantially reduced average power to the one of the lines and monitoring the one of the lines to determine whether DSL communications have restarted being received from the one of the DSL modems. The method also includes resuming the maintaining of the temporally parallel DSL communication sessions in response to the monitoring determining that DSL communications have restarted being received from the one of the DSL modems.

Description

[0001]This application claims the benefit of U.S. provisional Application No. ______, “Signal Suspension And Resumption in DSL Systems”, filed Jun. 4, 2008, by Adriaan J. de Lind van Wijngaarden, Jochen Maes, Carl J. Nuzman, and Danny van Bruyssel.BACKGROUND[0002]1. Technical Field[0003]The invention relates to multiple channel communication systems.[0004]2. Discussion of the Related Art[0005]This section introduces aspects that may be helpful to facilitating a better understanding of the inventions. Accordingly, the statements of this section are to be read in this light and are not to be understood as admissions about what is in the prior art or what is not in the prior art.[0006]Many digital subscriber line (DSL) communication systems are susceptible to downlink and uplink crosstalk between the local-end telephone lines that connect DSL modems of a central office (CO) to DSL modems at customer premises. The crosstalk may be caused, in part, by inductive coupling between twisted p...

AI Technical Summary

Benefits of technology

[0009]Various embodiments provide DSL communication apparatus and methods that support DSL vectoring. The methods and apparatus are configured to manage responses to events that interrupt DSL communications between a DSL modem of a central office and a DSL modem of a customer premises. The methods and apparatus can limit the harmful effects of crosstalk that such events cause on the DSL communications between other DSL modems. The methods can also reduce the need to re-measure elements of channel matrices so that the amount of DSL re-initialization can be reduced.

Problems solved by technology

Many digital subscriber line (DSL) communication systems are susceptible to downlink and uplink crosstalk between the local-end telephone lines that connect DSL modems of a central office (CO) to DSL modems at customer premises.

The crosstalk can negatively affect DSL communications between the CO and the customer premises in the uplink and the downlink directions.

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